Method for producing laminate, laminate, light guide body for light source devices, and light source devices

Abstract

A laminate which is provided with a core layer, a first cladding layer, a second cladding layer and a light output means, and wherein the second cladding layer, the core layer and the first cladding layer are sequentially laminated. The refractive index of the first cladding layer and the refractive index of the second cladding layer is lower than the refractive index of the core layer. The light output means is composed of a recess that penetrates through the first cladding layer and reaches the inside of the core layer, and the curvature radius of the forefront part of the recess is 10 μm or less.

1 . A laminate comprising:
 a core layer;   a first cladding layer;   a second cladding layer; and   a light emitting element,   wherein the second cladding layer, the core layer, and the first cladding layer are sequentially laminated,   wherein a refractive index of the first cladding layer and a refractive index of the second cladding layer are lower than a refractive index of the core layer,   wherein the light emitting element is a concave portion penetrating the first cladding layer and reaching an inner portion of the core layer, and   wherein a radius of curvature of a distal end portion of the concave portion is 10 μm or less.   
     
     
         2 . The laminate according to  claim 1 , wherein the radius of curvature of the distal end portion of the concave portion is 3 μm or less. 
     
     
         3 . The laminate according to  claim 1 , wherein the light emitting element is installed by press processing. 
     
     
         4 . The laminate according to  claim 1 , wherein a depth of the light emitting element is larger by 5 μm or more than a thickness of the first cladding layer. 
     
     
         5 . A laminate comprising:
 a core layer;   a first cladding layer;   a second cladding layer; and   a light emitting element,   wherein the second cladding layer, the core layer, and the first cladding layer are sequentially laminated,   wherein a material constituting the core layer is a polycarbonate resin,   wherein a refractive index of the first cladding layer and a refractive index of the second cladding layer are lower than a refractive index of the core layer,   wherein the light emitting element is a concave portion penetrating the first cladding layer and reaching an inner portion of the core layer, and   wherein a yellowness index of the laminate measured in accordance with ASTM Standard D1925 is −3 or less.   
     
     
         6 . The laminate according to  claim 5 , wherein a radius of curvature of a distal end portion of the concave portion is 10 μm or less. 
     
     
         7 . The laminate according to  claim 1 , further comprising a light reflecting layer. 
     
     
         8 . The laminate according to  claim 1 , further comprising a layer of at least one type selected from a group including a design layer and a light diffusion layer. 
     
     
         9 . A method for producing a laminate comprising:
 laminating a first cladding layer on a first surface of a core layer;   laminating a second cladding layer on a second surface of the core layer; and   installing a light emitting element,   wherein a refractive index of the first cladding layer and a refractive index of the second cladding layer are lower than a refractive index of the core layer, and   wherein the light emitting element is installed by press processing.   
     
     
         10 . The method for producing a laminate according to  claim 9 , wherein the light emitting element is a concave portion penetrating the first cladding layer and reaching an inner portion of the core layer. 
     
     
         11 . The method for producing a laminate according to  claim 9 , wherein a radius of curvature of a distal end portion of the concave portion is 10 μm or less. 
     
     
         12 . The method for producing a laminate according to  claim 9 , wherein a machining blade used for the press processing is of a corrosion type. 
     
     
         13 . A laminate obtained by the method for producing a laminate according to  claim 9 . 
     
     
         14 . A light guide body for light source device comprising the laminate according to  claim 1 . 
     
     
         15 . A light source device comprising the laminate according to  claim 1 .